INT 13 - IBM/MS INT 13 Extensions - EXTENDED MEDIA CHANGE AH = 49h DL = drive number Return: CF clear if media has not changed AH = 00h CF set if media may have changed AH = 06h (see #00234) Note: unlike AH=16h, any drive number may be specified SeeAlso: AH=16h,AH=41h"INT 13 Ext",AH=46h